Stand for flower (5)
I believe the answer is:
brook
I believe this clue is a double definition.
'stand for' is the first definition.
(I've seen this before)
'flower' is the second definition.
(thesaurus)
(Other definitions for brook that I've seen before include "Bear - small stream" , "Stand for" , "Small fresh-water stream" , "running water" , "Allow" .)